There is a really elegant cheat involved
Go to Weasners ETX site and look at the Sun as asteroid section
( I would give you an URL but PlOptus still blocks the site for me )
Basically, a very clever sod generated an asteroid that is an exact copy of earth, but out of phase by 1/2 a year
Thus, every time you "goto" it, the bl#&dy sun is in the way.
It still only tracks at sidereal rate, so minor tweaks are required to keep it centred, but its very accurate.
As to a solar finder, a bit of 25mm PVC pipe ( say 50mm to 75mm long ) and some masking tape is perfect.
Tape the pipe to yr OTA ( or use a fancy holder if you want )
Put masking tape over the front of the pipe with a pinhole in the middle.
Put masking tape over the rear
Once lined up on the sun, use a texta to draw a cross on the rear tape
where you see the projected image of the sun
Works perfectly and cost nothing.